1) That is even more true for tiered pricing. Is there an alternative you know of that doesn't involve the price going up as your usage goes up?

2) If you expect software pricing to match the marginal cost to the supplier, then I think you're out of luck. All software is this way. There are huge up-front costs to build the software, and the cost of actually selling an individual license is close to zero.

Pricing in general shouldn't be about what a product costs to provide, but rather what it's worth to the customer.